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Tornado726
Asked: 2024-07-31 23:01:19 +0800 CST

我有一个 bash 脚本要求输入，但如果输入的格式不正确，我想再次要求输入。不知道如果没有 GOTO 循环该怎么做

  • 772

我正在编写一个 bash 脚本，它会要求输入（在本例中是 IP 地址），但如果 IP 地址格式不正确，我希望它一直询问，直到用户正确输入。我问的是当 bash 没有 GOTO 命令时如何执行 GOTO。最简单的方法是什么？

我的代码是：

#!/bin/bash
# There will be additional code here that is not relevant to this question.
# Ask for IPv4 address
echo    Please type the IPv4 address of the host:
read ipv4addr
if [[ $ipv4addr =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
  # do something
else
  echo "The IP address is not in the correct format. Please try again."
  # I need to have it go back to #Ask for the IPv4 address  
fi
bash

3 个回答

  1. Best Answer

    您可以使用 shell 的循环结构之一- 例如while循环：

    #!/bin/bash

while :
do
  read -p "Please type the IPv4 address of the host: " ipv4addr
  if [[ $ipv4addr =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
    break
  else
    echo "The IP address is not in the correct format. Please try again."
  fi
done

# do something
    • 2

  2. 由于您想要提示输入直到收到有效输入，因此请考虑使用until循环：

    until
  echo Please type the IPv4 address of the host:
  read ipv4addr
  [[ $ipv4addr =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]
do
  echo "The IP address is not in the correct format. Please try again."
done
# Do the "something" here.
    • 1

  3. 我发现我可以使用函数来做我想做的事情。

    #!/bin/bash
function readipv4addr()
{
echo    Please type the IPv4 address of the host\:
read ipv4addr
echo    The FQDN is\: $fqdnhost
if [[ $ipv4addr =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
  domain=${fqdnhost#*.}
# do something.
else
  echo "The IP address is not in the correct format. Please try again."
readipv4addr  # loops back to beginning of function here.
fi
}

# begin execution of script
    • 0

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